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air pump angle angle of incidence apparatus of Fig armature attached attraction battery beam body bulb called Capillarity causes centre of gravity colors condenser conductor connected consists convex lens copper cord cylinder density determined direction distance earth effect elasticity electricity Electroscope equal expansion force acts friction Galvanometer gases globe heat Hence Hydrometer Induction instrument insulated intensity inversely iron laws length lens lever Leyden Jar light liquid luminous magnet melting mercury metal millimetres mirror molecules motion move needle north pole number of vibrations Pascal's law passes Pendulum perpendicular piece pipe piston pith ball placed plane plate plumb line Polarization pole pressure principal focus principle produced rays reaches reflected refracted removed screw Section shellac shown shows side solid sound specific gravity steam substances sulphuric acid surface temperature thermometer tion tricity valve vapor varies velocity vessel weight wheel wire zinc
Page 50 - This proportion teaches us that, when in equilibrium, the power is to the weight as the height of the plane is to its length.
Page 5 - ... the earth about the sun ; nevertheless, for the better knowledge of the whole subject, it will be necessary to premise a few general observations. It is, in the first place, evident that bodies cannot themselves change their condition, and that thus a body once set in motion can never stop — that it will continue to move in the same direction and with the same velocity as when it set out, unless some other external force changes its direction or velocity.
Page 61 - ... ratio of the weights of equal volumes of two bodies being always the same, if the unit of volume of each be taken, and one of the bodies become the standard, its weight will become the unit of weight. The term density denotes the degree...
Page 88 - ... mercury is sustained by and exactly balances the downward pressure of the air upon the surface of the mercury in the cup. The height of...
Page 224 - ... 196.) Second Experiment. If a needle of tempered steel (fitted with a little brass cup in the centre to work upon a point) is rubbed with the loadstone in one direction only, it is rendered permanently magnetic, and will now be found to take a certain fixed position, pointing always in a direction due north and south. The end which points towards the north is called the north pole, and the other extremity the south pole, and it is usual to mark the north pole with an indent or scratch to distinguish...
Page 29 - A homogeneous sphere is suspended from a point by means of a fine thread, find the length of a simple pendulum which will oscillate in the same time.
Page 193 - ... that the ratio of the sines of the angles of incidence and refraction is constant for refraction in the same medium, was effected by Snell and Descartes.
Page 280 - Scale of Hardness 1 - Talc 2 — Gypsum 3 — Calcspar 4 — Fluorspar 5 — Apatite 6 — Feldspar 7 — Quartz 8 — Topaz 9 — Sapphire 10 — Diamond of hardness, Table 16-7.